How to Invest Lottery Winnings Without Losing Them
A conservative framework for turning a one-time windfall into permanent income, and the specific failure modes that destroy lottery fortunes.
Updated
Start by doing nothing
Park the entire after-tax balance in Treasury bills or a government money market fund for six months. These are about as close to risk-free as financial instruments get, and they currently pay a meaningful yield.
This is not a missed opportunity. Six months of conservative positioning costs very little relative to the balance, and it buys the one thing you genuinely need: time for the initial period of poor judgement to pass.
Size the withdrawal, then build backwards
Decide what annual income you want, then work out what principal supports it. A 4% withdrawal rate is the standard planning assumption for a portfolio intended to last indefinitely, and it is the figure this site's calculator uses.
At 4%, $10 million of invested principal supports roughly $400,000 a year. $100 million supports about $4 million a year. Run that calculation before deciding what you can afford to spend, not after.
Anything you spend comes out of the income-producing base permanently. A $20 million house is not a $20 million decision; it is a $800,000-a-year decision, forever, before you have paid the property tax on it.
The specific ways this goes wrong
Concentration. Putting a large share into one business, one property market, or one friend's venture. Diversification is unglamorous and it is the entire game.
Illiquidity. Assets that cannot be sold quickly (private businesses, exotic property, collectibles) look fine until you need cash and discover the market is three interested buyers wide.
Lending to people you know. Loans to friends and family are rarely repaid and reliably damage the relationship. If you intend to help someone, make it a gift, size it so you do not care whether it comes back, and mind the gift tax rules.
Recurring costs. Aircraft, boats, multiple properties and staff carry annual costs that are a large fraction of the purchase price. These are the commitments that quietly consume a fortune.
Advisor risk. Commission-based advisors, insurance products sold as investments, and anyone who approaches you unsolicited. Use a fee-only fiduciary and verify their registration yourself.
A defensible default
A globally diversified portfolio of low-cost index funds, split between equities and high-quality bonds according to your tolerance for volatility, rebalanced annually, held for decades.
It is boring, it is what most institutional money does, and it beats the large majority of actively managed alternatives after fees. For someone whose objective is to not lose a windfall rather than to maximise it, boring is the correct target.